/// <summary>
        ///  Adds the specified Availability Zones to the set of Availability Zones for the specified load balancer.
        ///  The load balancer evenly distributes requests across all its registered Availability Zones that contain instances.
        /// </summary>
        /// <param name="loadBalancer">The name associated with the load balancer.</param>
        /// <param name="zones">The Availability Zones to add to the load balancer.</param>
        /// <param name="settings">The <see cref="LoadBalancingSettings"/> used during the request to AWS.</param>
        /// <param name="cancellationToken">A cancellation token that can be used by other objects or threads to receive notice of cancellation.</param>
        public async Task <bool> EnableAvailabilityZones(string loadBalancer, IList <string> zones, LoadBalancingSettings settings, CancellationToken cancellationToken = default(CancellationToken))
        {
            if (String.IsNullOrEmpty(loadBalancer))
            {
                throw new ArgumentNullException("loadBalancer");
            }
            if ((zones == null) || (zones.Count == 0))
            {
                throw new ArgumentNullException("zones");
            }



            //Create Request
            AmazonElasticLoadBalancingClient client = this.CreateClient(settings);
            EnableAvailabilityZonesForLoadBalancerRequest request = new EnableAvailabilityZonesForLoadBalancerRequest();

            request.LoadBalancerName = loadBalancer;

            foreach (string zone in zones)
            {
                request.AvailabilityZones.Add(zone);
            }



            //Check Response
            EnableAvailabilityZonesForLoadBalancerResponse response = await client.EnableAvailabilityZonesForLoadBalancerAsync(request, cancellationToken);

            if (response.HttpStatusCode == HttpStatusCode.OK)
            {
                _Log.Verbose("Successfully enabled zones '{0}'", string.Join(",", zones));
                return(true);
            }
            else
            {
                _Log.Error("Failed to enabled zones '{0}'", string.Join(",", zones));
                return(false);
            }
        }